diff --git a/README.md b/README.md
index c016747..b74b143 100644
--- a/README.md
+++ b/README.md
@@ -104,7 +104,7 @@ Noted that the UI is unauthenticated when you installed Longhorn using YAML file
 
 # Upgrade
 
-Since v0.3.3, Longhorn is able to perform fully-automated non-disruptive upgrade, meaning the upgrade process won't disrupt  the access to existing volumes.
+Since v0.3.3, Longhorn is able to perform fully-automated non-disruptive upgrades, meaning that the upgrade process won't disrupt the running volumes. Existing volumes continue to run even as the software that implements these volumes are upgraded.
 
 If you're upgrading from Longhorn v0.3.0 or newer: